Before diving into new brakes, you'll want to check out the axles, it can sometimes get tough to match up brake parts to these old things, and if the axle is bad you'd replace it with all new brakes and start new. Chances are if the axle is original its time to replace it. If you go to inlandrv.com you can read about the axle and how to check it out yourself. They (and others) sell replacement axles, we chose to get ours from Andy at Inland, very easy to install.
Scott & Megan
VAC LIBRARIAN WBCCI 8671
1963 Safari from the 1963-64 Around the World Caravan